High-temperature superconducting filter using self-embedding asymmetric stepped impedance resonator with wide stopband performance and miniaturized size

doi:10.1088/1674-1056/26/10/108502

Abstract In this study, a novel self-embedding asymmetric stepped impedance resonator (SE-ASIR) topology is proposed. By embedding asymmetric stepped impedance resonators in themselves, circuit sizes of ASIRs can be reduced effectively, while the ability to control spurious modes of ASIRs remains. Therefore, SE-ASIRs are suitable for being used to design filters with wide stopbands and miniaturized sizes. Furthermore, the construction process of the SE-ASIR is described in detail, and an equivalent model of the SE-ASIR is proposed. For demonstration, a high-temperature superconducting bandpass filter centered at 1112 MHz is designed and fabricated. The measured result agrees well with the simulation result and shows that the out-of-band rejection is better than 60 dB up to 4088 MHz, which is about 3.7 times the center frequency. The filter circuit size is 31 mm×13 mm or 0.28 λ_g×0.12 λ_g, where λ_g is the guided wavelength at 1112 MHz.

Keywords: high-temperature superconducting bandpass filter microstrip filter wide stopband

Received: 28 April 2017
Revised: 12 June 2017
Accepted manuscript online:

PACS:

85.25.-j

(Superconducting devices)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61371009) and the National High Technology Research and Development Program of China (Grant No. 2014AA032703).

Corresponding Authors: Bin Wei
E-mail: weibin@mail.tsinghua.edu.cn

Cite this article:

Dan Wang(王丹), Bin Wei(魏斌), Yong Heng(衡勇), Bi-Song Cao(曹必松) High-temperature superconducting filter using self-embedding asymmetric stepped impedance resonator with wide stopband performance and miniaturized size 2017 Chin. Phys. B 26 108502

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High-temperature superconducting filter using self-embedding asymmetric stepped impedance resonator with wide stopband performance and miniaturized size

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